Rotary web printing press



y 1940- i H. M. BARBER 2.199.812

ROTARY WEB PRINTING PRESS Filed June 6, 1939 E1 G! $1 R1 8 Q v Q N k vQ} 0 a 1 v Q] 0 0 @5 l g; I

. I I i on O Q & $5

N O INVENTOR VP Q] Mam 8 0 BY \2) m 9 YATTORNEYS' represented as a fivecolor unit, the impressiom Patented May 7, 1940 v greater PxrauTorrreaROTARY WEB PRINTING PRESS Howard M. Barber, Pawcatuck, Com, assignor toC. B. Cottrell & Sons Company, Westerly, 3.1., a corporation of Delaware4 Application June 6, 1939, Serial No. 277,570

2 Claims.

In high speed rotary web presses where quick drying inks are used in theprinting units it is usual to provide drying units to dry the freshlyprinted web after it leaves the printing units.

These drying units usually dry the ink by evaporation-and, in any event,through the application to the web of a considerable degree of heat bymeans of gas burners, steam drums, or the like, in combination with acooling means. Under this treatment the web has a tendency to shrink sothat due to the increase in tension there is less paper being presentedto the second printing unit than was presented to the first printingunit. Therefore, if the corresponding form and impression cylinders ofthe printing units are made exactly the same size and the plates andmakeready bear the same relation to the bearers of the respectivecylinders, the web will either break or run under suchextreme tensionthat it will wrinkle badly and otherwise interfere with the colorregister in the second printing unit.

The object of my invention is to provideaccurate register in a rotaryweb printing press in the second printing unit, said unit comprising animpression cylinder and form cylinders therefor, the diameters of saidcylinders being slightly less than the diameters of the correspondingcylinders of the first printing unit.

A practical embodiment of my invention is represented in theaccompanying drawing which is a diagrammatic representation of a sideelevation of so much of a printing 'press as will give an understandingof my invention.

In the form shown, the first printing unit is cylinder being denoted byI and its five form cylinders by 2, 3, l, 5 and 6. Inking mechanisms forthe form cylindersare denoted by 2 3, 4 5 and 6, and apply the ink totheir respective form cylinders in the usual manner.

The second printing unit for perfecting the web is herein represented asa five color unit, the impression cylinder being denoted by l and itsfive form cylinders by 8.8, Ill, II and I2; the diameters of theimpression and form cylinders of this second printing unit are slightlyless than the diameters of the corresponding cylinders of the firstprinting unit; The inking mechanisms for the form cylinders of thesecond printing unit are denoted by 8?, 9, l0, H and I2, and apply theink to their respective form cylinders in the usual manner.

The first drying unit is herein represented as comprising a heating unitI3, such as a gas burner and two cooling cylinders I4 and I5.

The second drying unit is herein represented as comprising a heatingunit l6, such as a gas burner and two cooling cylinders l7 and i8.

These two I drying units are provided with shields l9 and 20 in orderthat the vapors arising from drying the web may be easily disposed ofand dissipated by blower or auction devices ii, 22 so that the vaporswill not again come in contact with the printed surface of the web.

Any heating medium, such as gas, may be applied to the heating units i3,i6, and any suitable cooling medium, such as cold water, may be suppliedto cooling cylinders l4, l5 and i1, ill.

The web may be fed from the supply roll 23 in any well known or approvedmanner.

In operation, the web is led from the supply roll to and through thefirst printing unit where it is printed in multicolor on the first sidethereof then to and through the heating unit l3 and around the coolingcylinders i8, i5 of the first drying unit. From theme the web is led toand through the second printing unit where it is printed in multicoloron the second side thereof, then to and through the heating unit l6 andaround the cooling cylinders 11, it of the second printing unit. Theperfected web may then pass in any desired direction to a deliverypoint.

The means for driving the several'units is not shown or described hereinbut any well known or approved means may be used. Itwill be understoodthat either of the units may be driven separately either for the purposeof making-ready or for any other purpose.

V It is to be understood that guide rolls are provided for passing theweb from the supply roll in prescribed paths to and through the severalunits and to a predetermined delivery point.

While I have shown and described five form cylinders for each printingunit, it is evident that if so desired, one or more of the formcylinders may be silenced in the usual manner.

Also, while I have shown drying units for each printing unit it isobvious that the second drying unit may be eliminated if so desired.

It is to be understood that any well known or approved quick drying inksmay be used in the printing press. 4

From the above description it will be seen that I have provided not;only a simple but effective means whereby register may be efiected inthesecond printing unit with a minimum of effort by making the cylindersthereof slightly smaller than the corresponding cylinders of the firstprinting unit. 1

It is evident that various changes may be resorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention, and hence I do notintend to be limited to the particular embodiment herein shown anddescribed, but

What I claim is:

1. In a rotary web printing press, first and second printing units, eachprinting unit comprising an impression cylinder and form cylinders, andmeans for drying the web after it leaves the first printing unit, thediameters of the impression and form cylinders of the second printingunit being slightly less than the diameters of the correspondingimpression and form cylinders of the first printing unit.

2. In a. rotary web printing press, first and second printing units,each printing unit comprising an impression cylinder and form cylinders,means I for drying the web after it leaves both the first and secondprinting units, the diameters of the impression and form cylinders ofthe. second printing unit being slightly less than the diameters of thecorresponding impression and form 10 cylinders of the first printingunit.

HOWARD M. BARBER.

